It's not quite the App Store, but Ustream's broadcasting app is here on jailbroken…
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Granted, there are other applications in the App Store that already do this like Kyte and 12Cast, but UStream promises high quality video and better flexibility with regard to where your video is shared. Currently, videos can be uploaded to UStream, YouTube, Twitter, Facebook, or UStream on Facebook. You can even edit videos already on UStream directly from your iPhone.

It isn't the live streaming everyone wants, but until Apple and AT&T allow it to happen, developer's hands are tied. [TechCrunch]